Processes for preparing of 3,4-alkylenedioxythiophenes and 3,4-dialkoxythiophenes
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United States of America Patent
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Apr 10, 2007
Grant Date -
Jul 29, 2004
app pub date -
Nov 19, 2003
filing date -
Nov 19, 2002
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Abstract
The present invention relates to a process for preparing 3,4-dialkoxythiophenes or 3,4-alkylenedioxythiophenes in high yield via the rapid decarboxylation of 3,4-dialkoxythiophenedicarboxylic acid or 3,4-aklylenedioxythiophenedicarboxylic acid in a water-miscible polar solvent in the presence of copper catalyst under an oxygen atmosphere.
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